Speaker



FIG. 1 is a front perspective view of a speaker showing my new design;

FIG. 2 rear perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof, the right side being a mirror image;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof. 

The ornamental design for a speaker, as shown and described. 